API-22657 526 v2 service description for attachments

[rockwellwindsor-va]

Updates swagger docs for v2 dev., updates route

Summary

• Update /attachments url to be /veterans/{veteranId}/526/{id}/attachments
• Add service description for /veterans/{veteranId}/526/{id}/attachments

Related issue(s)

API-22657

Testing done

• Compile docs, view docs for v2 dev

Screenshots

What areas of the site does it impact?

modified: modules/claims_api/app/swagger/claims_api/v2/dev/swagger.json
modified: modules/claims_api/config/routes.rb
modified: modules/claims_api/spec/requests/v2/veterans/rswag_disability_compensation_request_spec.rb

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog or Grafana (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature